Renewable fuse-attachment plug



F F FRAKES RENEWABLE FUSE ATTACHMENT PLUG Filed Jan. 21. 1926 Nov. 8, 1927.

Snom/Moz Patented `Nov. 8, 1927.

f UNITED STATES,

PATENT OFFICE.

EEANK E. EEAKES, OE COLUMBIA, TENNESSEE, AssrGNoa OE ONE-HALE To JOSEPH M.

- DEDMAN, OE COLUMBIA. TENNESSEE.

RENEWABLE FUSE-ATTACHMENT PLUG.

Application led January 21, 1926. Serial No. 82,781.

The present invention relates to attachment plugs especially adapted for use in connection with electrical appliances to feed sockets and more particularly attachment plugs having renewable fuses.

An important object of the invention is to provide a novel and inexpensive means for automatically breaking the circuit to the appliance, should a short circuit occur which would ordinarily burn out the wire or appliance.

A further object of the invention is the provision of a device of this character which will be readily repaired by .persons unfamiliar with mechanics, to the end that the socket may again be brought into service.

With the foregoing and other objects in view which will appear as the descrip-tion proceeds, the invention resides in the combination and arrangement of parts and 1n the details of construction hereinaftendescribed and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made 5 within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawing:

Figure 1 is a sectional view through an attachment plug constructed in accordance' with the invention.

` Figure 2 is a sectional View through an attachment plug, after the fuse has been burned out.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 4.- is a bottom plan view of the attachment cap.

Referring to the drawing in detail, rthe reference character 5 indicates the plug section ofthe attachment plug, and as shown, the same is provided with the usual metallic threaded end member 6 that cooperates with the threaded socket in which the plug is to be positioned, for securing the plug within the socket.

Pairs of spring fingers 7 are provided in the plug section, and as illustrated by Figures 1 and 2, these lingers cooperate to grip the contact arms 8 that form a part of the attachment cap 9 which constitutes -the upper section of the plug.

' spring arm.

Secured within the attachment. cap 9 is a spring arm 10 which extends downwardly in parallel relation with the arms 8, and adjacent to one of the arms. The free end of the arm 10 is adapted to be moved into engagement with the arm 8 adjacent thereto,

there being provided a. securing lnember `1l formed of suitable fusible material adapted to hold the arm 1() adjacentl to the arm 8, associated therewith, .to the end that electric energy passing through the arm 8 will be directed to the arm 10 through the wire.

Wires 12 and 13 extend into the usual central opening of the attachment cap, one ot the wires being secured to the screw 14 that is employed for connecting the arm 10 to the cap, to theend that electric energy will be carried oil' through the wire 12, to the appliance which is connected with the opposite end of the wires. y

From the foregoing it will be seen that should al short circuit occur in the electric circuit and which would otherwise result in the burning out ofv the electric appliance or Wire, fuse member 11 will be burned allowing the arm 10 to spring outwardly away from the arm 8 as shown by Figures 2, thereby breaking the circuit.

To renew the plug, it is only necessary to disconnect the plug section and attachment cap, and move the arm 10 into close engagement with the arm 8 and place a. fusible member over the arms to connect them.

In combination with a separable electric plug having pairs of' spring fingers and substantially straight contact arms to be positioned between the spring lingers, a spring arm secured to one of the sections and arranged adjacent to one of the contact arms, a securing wire of fusible material vfor securing the spring arm to the contact arm, and said securing arm adapted to be slid over the tree ends of the contact arm and In testimonyitliat I claim the foregoing as my Own, I have hereto aliixed my signature.

FRANK E. FRAKES. 

